Speed control valve



April 8,1 1947- H. c. HALLERSTROM 2,418,634

SPEED CONTROL VALVE Filed N ov. 8, 1943 2 Sheets-Sheet 1 u HW W/ f Z4April 8, 1947. H. c. HALLERsTRoM SPEED CONTROLV VALVE Filed Nov. 8, 19432 Sheets-Sheet 2 Patented Apr. 8, 1947 SPEED CONTROL VALVE Harold C.Hallerstrom, Evanston, lll., assgnor to Hanna Engineering Works,Chicago, Ill., a corporation of Illinois Application November 8, 1943,Serial No. 509,349

4 Claims.

The invention relates to valves and has reference more particularly to atwo-way speed control valve of improved construction and operation.

It is often necessary to control the rate of ow of a gas or liquidthrough a conduit, as, for example, to and from an operating cylindersuch as is used on a hoist or similar machine. This is best done bymeans of a control valve in connection with another valve, the rst valvecontrolling the rate of flow and thus the speed in each direction, andthe other valve turning on and olf the ow of the fluid and determiningits direction of flow.

An object of the invention is to provideaJ speed control valve whichwill fulll the exacting demands of present day service.

Another object of the invention is to provide a speed control valvewhich will be simple in design, easy to install, easy to adjust andclean, and which will give long and satisfactory service.

Another object is to provide a valve as described which will be capableof the fine adjustments necessary in the timed operations of numerousliquid and gas operated machines, and which adjustments from minimumflow to maximum capacity in one direction is entirely independent of theexisting adjustment in the opposite direction.

Another object is to provide a two-way speed control valve having amovable valve element which will be guided at all times in itsreciprocating movements by at least two spaced guiding surfaces, andwhich valve element will have a no-flow position determined by twobalanced oppositely acting springs toeliminate shock when the flow isterminated.

A further object is to provide a control valve wherein the parts arearranged so that theldirection of flow will be axial of thereciprocating Valve element and wherein the pressures within the housingwill be balanced to relieve eddy currents against the W pressure end ofthe said valve element.l

"With these and various objects in View, the invention may consist ofcertain novel features of construction and operation, as will be morefully described and particularly pointed out in the specification,drawings and claims appended hereto.

In the drawings, which illustrate an embodiment of the device andwherein like reference characters are used to designate like parts-Figure 1 is a top View in plan of the `two-way speed control valve ofthe invention;

Figure 2 is an end elevational view;

Figure 3 is a sectional view taken substantially 2 vertically throughthe valve showing the improved construction of the invention;

Figure 4 is a horizontal sectional view taken along line 4-4 of Figure 3and looking in the direction of the arrows;

Figure 5 is a horizontal sectional view taken substantially along line5--5 of Figure 3 and looking in the direction of the arrows;

Figure 6 is a vertical sectional View similar to Figure 3 but showingthe reciprocating valve element in one position of operation;

Figure '7 is a vertical sectional view but showing the reciprocatingvalve element in :another position of operation with the same settingfor the adjustable stopsV as in Figure 6;

` ,Figure 8 is a fragmentary sectional view showing one manner ofnotching the operating ends of the reciprocating valve element;

Figures 9 and 10 are fragmentary elevational views showing dierentpreferred shapes for the operating end of the reciprocating valveelement;

and l i Figure 11 is a fragmentary sectional View showing the operatingend of the reciprocating valve element provided with an opening.

Referring to the drawings, the housing or casing Ill of the valve isprovided with openings II and I2 for pipe connections. Opening II in theleft end of the Valve, Figures 3, 6 and 7, leads to an interior chamberI3 of semi-circular shape having an inlet end I4 in the upper extremitythereof and an outlet end I5 in the lower extremity thereof. The openingI2 leads to a chamber I6 also of semi-circular shape and which includesan inlet end I1 in the lower extremity thereof and an outlet I8 in theupper extremity. 'I'he arrangement of the chambers I3 and I6 provides aninternal partition 2B of serpentine shape and which internal partitionis formed with three co-axial openings of the same size. Opening 2I, asbest shown in Figure 6,eXtends from the outlet of chamber IB to theinlet of chamber I3. Opening 22 in a similar manner extends from theoutlet of chamber I3 -to the inlet of chamber I6, as best shown inFigure 7. The serpentine partition 2G is formed with a third centrallylocated opening 23 which receives the reciprocating valve element2l,'saidv Valve element having a sliding't in opening 23 and thus beingguided by said opening 'in its reciprocating moveopening 2| and itsopposite end into opening 22. It will therefore be understood that whenthe valve element is centrally positioned said openings 2| and 22 areclosed thereby. Said element has a recess in each end which extends tothe middle partition 25. The walls of the valve element on each side ofthe partition are of relatively thin metali andf the exterior surfacesof the samev have a sliding fit with the central opening 23 and withopenings 2| and 22. The respective ends of the valve element may benotched; curved or pointed, as illustrated in Figures 8, 9 and 10.Figure 8 illustrates one manner of providing the respective ends of thevelement with af- V-shaped notch 26, According-toliigures 9 andy l therespective ends may be pointed as at 21 which forms semi-circularopeningsk 28- at the sides. According to Figure 11 the respective endsof the valve element may be provided with-` an openingr 3B.

The valve housing Ill is provided with a top opening 32 and with asimilar bottom opening. 33. Both. top and' bottom openings are closedbythe closure members 34 and 35, respectively, each member beingsuitably secured to the valve housing by screws'36; as best shownr inFigure 1. The top member 34 i's integral with an inwardly extendingportion 31-V which is threaded to receive the screw 38 providing.anadjustable stop to limit reciprocating movement of the valve element24 when the same moves upwardly toward the top closure member 24; Thescrew 38 includes the head portion 43' having location within the well4|'. Packing L12-is carried by said head portion i3 and 'the same isprovided with a hexagonal socket 43 for receiving a` tool whereby screw38 can be'rotatedy to vary its position longitudinally with respect tothe inwardly extending portion 31'` The bottom member 35 is similarlyformed with an integral portion 44 which receives the threaded screw-45. rIhe head portion 46 of said screw is received within the well 41and said head portion carries packing 48; The hexagonal socket I) in thehead' portion likewise receives a tool by means of which the adjustmentofscrew 45 canbe varied'.

The top and bottommembers 34 andy 35 and inwardly directed portions 31and 44 serve a triple purpose in that they render accessible theinterior of the valve housing I0, provide bearing surfaces for the endsof the coil springs 5| and IEiland with the adjusting screws 38 and 45form adjustable stops for limiting the movement, of the valve elementk24 to thus serve to x the size of each of the two independent openings2| and 22. The coil spring 5| seats against closure member 34 at one endand extends within the valve element to seat against the middlepartition 25 at its opposite end. The coil spring 52 seats againstclosure member 35 and is likewise received by the valve element to seatagainst the opposite side of the middle partition.

When there is no flow of fluid through the valve in either direction thevalve element is. held in its middle or neutral position as shown inFigure 3, by means of the springs 5| and 52, which are adjusted' toapply substantially uniform pressure to said reciprocating valveelement. The-chambers in the valve housing are so shaped aroundl thevalve elementa that lateral fluid pressures against the same arebalanced, thus'making the movements ofthe valve element virtuallyfrictionless, andY insuring negligible wear and leakage. This'feature.in thev construction of the present valve willgbe clearly evident fromvFigures 4 4 and 5. The inlet and outlet end of each chamber extendscompletely around the valve element. Figure 6 shows the reciprocatingvalve element in one position of operation wherein uid is flowing fromchamber i6 into chamber I3. The direction of flow is clearly indicatedby the arrows. When the fluid enters chamber l5 the pressure ot. thesame on the valve element 24, together with the pressure of the coilspring 5|, is such as to over-balance coil spring 52 and thus the valveelement is caused to move in a downward. direction, permitting theliquid to flow through opening 2|, which flow will continue as long, as'the valve element remains in this overbalancedl position where themiddle partition 25 ismaintained inlcontact with adjusting screw 45. Theposition of adjusting screw 45 therefore determines the extent ofmovement of the valve element in a downward direction and accordinglydetermines the size of opening 2|. Therefore screw- 45 will regulateflow from chamber I6 to chamber I3J andv a feature ot the inventionresides in the fact that the adjustment ofsaid screw for regulatingthelow of the iluid in this directionV is entirely independent ofadjustment of screw 38- for regulating flow of fluid in an oppositedirection.

Referring toil'igurey 7, it will be seen that the fluid is ilowing fromchamber I3 to chamber I6 but thatV the flow is at a substantiallyrestricted rate compared to that taking. place in Figure 6. The reasonfor this restricted flow is due to-adjustment of screw 38 which has beenpositioned so as to limit-movement-of the valvev element in an upwarddirection. The `action of the uid pressure in chamber I3I inconjunctionkwith springl 52` is such as to over-balance the pressure of spring 5|:`but the valve elementY can move upwardly to anv extent only permitted byscrew 38.

The openings 2|I and- 2r are. shown in Figures 6 and 7 as` cylindricalAfor apart of their length and as having a. tapering inwardly directedend 3| for the remainder of their length". This makes possible veryneadjustments for the openings in the. valve. Other renement's inadjustment can be obtained by. leaving the openings 2| and 22cylindrical for theirentire length and giving various shapes to therespective ends of the' valve element as abovef describedl in connectionwith FiguresS tof 1l inclusive.

The invention is not to be limited to or by details of construction ofthe particular embodiment. thereof; illustratedr bythe' drawings,` asvari-ous'V other.` forms of the devicewill` of course e apparent tothose skilled im thei art. without departing from the spirit oftheinventionY or the scopeot theclaims';

What isbclaimed V1'. A speed control. valve including`v ai housinghaving' an` opening inl each end. thereof, an interna'l partition in.the housingy forming achember on each side communicating Iwith the endopenings respectively, said: partitionv havinga plurality of aligned.openings therein, a movable valve element having asliding nt in one of.`said aligned openingsv and being supported thereby for' reciprocating.n'iovemeni'j,I each end o'f the valve element being adapted to extendinto one of the other of the aligned openings to close the same,resilient means yieldingly maintaining said' valve element: in. neutralposition with said other openings closed; and a stop member at each endof; tlevalvefelement for limiting axial movement of: the valve: elementkinv either directibn.-`

2. A speed control valve including a housing e having an opening in eachend thereof, a partition in said housing forming a chamber on each sidecommunicating with the end openings respectively, said partition havinga valve opening in each extremity thereof and having a central openingaligned with the said valve openings, a movable valve element having asliding t in said central opening and 'supported thereby forreciprocating movement, said valve element having a length to extendfrom one valve opening to the other whereby said valve openings aremaintained closed when the valve element is in neutral position, aresilient coil spring located between each end of the valve element andthe housing and adapted to apply equal pressures to said valve element,and an adjustable stop member having location within each coil springand directed toward the valve element for limiting axial movement of thesame in either direction.

3. In a two-way speed control valve including a housing having anopening in each end thereof for connection with a uid supply conduit, aninternal partition in said housing forming a chamber on each sidecommunicating with the end openings respectively, said partition havinga serpentine shape and having three openings therein in alignedrelation, one of Said openings being located centrally of the partitionand the other two forming valve openings and being 1ocated at therespective extremities of the partition, a movable valve element havinga sliding t in the central 'opening and being supported thereby, saidvalve element when in neutral position having a length to extend intoeach Valve opening to close the same, opposed coil springs for saidvalve element adjusted to apply equal pressures on opposite sidesthereof for yieldingly maintaining the valve element in neutralposition, and an adjustable stop member in associated relation with eachcoil spring for limiting axial movement of the valve element in eitherdirection.

4. A two-way speed control valve as defined by claim 3, Awherein theopposed coil springs are conned between the valve element and thehousing, and wherein said adjustable stop members are independentlyadjustable from the exterior of the housing.

HAROLD C. HALLERSTROM.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 2,121,936 Thomas June 28, 19381,588,657 Christensen June 15, 1926 1,955,180 Furgason Apr. 17, 19342,228,082 Krome Oct. 3, 1938 2,358,611 Ziebolz Sept. 19, 1944 1,271,521Tate July 2, 1918 2,300,263 McLeod Oct. 27, 1942 245,662 RinderknechtAug. 16, 1881 FOREIGN PATENTS Number Country Date 441,223 French May 21,1912 361,441 British Nov. 26, 1931

